Definitely not. It's not a celebration. It's an exodus. Almost every business closes down, and almost all of the people go to the beach. If they are not near the beach, they go to the mountains. Anything to escape the heat. Ferragosto is not a celebration. It's a day where every body takes a day off of work, and heads out of town, often for the rest of the month. Leaving on the 15th is going to be a nightmare. It's the worst day of the year to travel, because everyone is traveling somewhere. It's possibly the only time to consider staying at an airport hotel the night before the flight. Or, stay the extra day or two not to celebrate Ferragosto because there are no festivities, but because travel will be much easier than the 15th.